A circle with equation x^2+y^2-2x+8y-40=0. Find the circle centre and the radius

2g=-2, -g=1. 2f=-8, -f=4. cc(-2,4). r=√(g^2+f^2-c)=√(4+16+40)=√80=4√5

LM
Answered by Liam M. Maths tutor

4690 Views

See similar Maths A Level tutors

Related Maths A Level answers

All answers ▸

Split (3x-4)/(x+2)(x-3) into partial fractions


If z is a complex number, solve the equation (z+i)* = 2iz+1 where the star (*) denotes the complex conjugate.


Find the exact solutions for 4 − x^2 = |2x − 1|


How can I improve my mathematics


We're here to help

contact us iconContact ustelephone icon+44 (0) 203 773 6020
Facebook logoInstagram logoLinkedIn logo

MyTutor is part of the IXL family of brands:

© 2026 by IXL Learning